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AP Intermediate 2nd Year Haloalkanes and Haloarenes — practice questions — page 2

Explore 34 free Haloalkanes and Haloarenes questions in AP Intermediate 2nd Year Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Haloalkanes and Haloarenes questions and exercises with answers

Showing questions 31–34 of 34.

As per your syllabus, the rate of HALOGENATION of alkanes (F₂, Cl₂, Br₂, I₂) decreases in which order?Read the answer and worked solution →As per your syllabus, the rate of substitution of HYDROGENS in alkane halogenation goes in which order (by carbon class)?Read the answer and worked solution →As per your syllabus, Mechanism, the FIRST step of methane chlorination under sunlight is best described as which?Read the answer and worked solution →As per your syllabus, the STAGGERED form of ethane is more stable than ECLIPSED for which reason?Read the answer and worked solution →

Worked practice questions

As per your syllabus, the rate of HALOGENATION of alkanes (F₂, Cl₂, Br₂, I₂) decreases in which order?

  1. F₂ > Cl₂ > Br₂ > I₂
  2. I₂ > Br₂ > Cl₂ > F₂
  3. Br₂ > Cl₂ > F₂ > I₂
  4. Cl₂ > F₂ > Br₂ > I₂
Show answer and solution

Correct answer: A. F₂ > Cl₂ > Br₂ > I₂

syllabus substitution: F₂ > Cl₂ > Br₂ > I₂ (fluorination is too violent, iodination reversible).

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As per your syllabus, the rate of substitution of HYDROGENS in alkane halogenation goes in which order (by carbon class)?

  1. 2° > 3° > 1°
  2. 1° > 2° > 3°
  3. All equal
  4. 3° > 2° > 1°
Show answer and solution

Correct answer: D. 3° > 2° > 1°

Your syllabus: 3° > 2° > 1° (matches free-radical stability — tertiary radical is most stable).

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As per your syllabus, Mechanism, the FIRST step of methane chlorination under sunlight is best described as which?

  1. Heterolysis of C-H bond
  2. Markovnikov addition
  3. Homolysis of Cl-Cl bond
  4. Wurtz coupling
Show answer and solution

Correct answer: C. Homolysis of Cl-Cl bond

syllabus Mechanism (i): Cl-Cl homolysis under hν gives two Cl• free radicals. Free-radical chain mechanism.

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More Chemistry topics

Amines and BiomoleculesThe d- and f-Block Elements & Coordination CompoundsElectrochemistryChemical KineticsHaloalkanes, Alcohols and EthersAldehydes, Ketones and Carboxylic AcidsSolutionsAlcohols, Phenols and Ethers